Final answer:
Fish have gills to breathe and birds have wings to fly.
Step-by-step explanation:
1. Fish have gills to breathe. Gills are specialized organs that extract oxygen from the water. They are located on the sides of a fish's head and allow them to extract oxygen from the surrounding water.
2. Birds have wings to fly. Wings are modified forelimbs that are adapted for flight. They are covered in feathers and generate lift, allowing birds to travel through the air.
Learn more about Fish, Birds